Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c6762994cfa243…

MALICIOUS

PDF

43.4 KB Created: 2021-06-11 05:50:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fdbbd8ef6450373005507c1699cdf461 SHA-1: 97728457ed3d1a29f20073a804745437f5d46751 SHA-256: 19c6762994cfa243ed1d2ae0b59ac6e2cae1ca79bcac4348c53d131022016155
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO poisoning tactic. The presence of a 'download button' lure further supports a malicious intent to trick users into downloading content. The ML classifier strongly indicates maliciousness, and the overall structure points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.tw/app/431946152/free-robux-oin-cata-game-hack PDF link annotation
    • https://milagrosjogja.com/ckfinder/userfiles/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://milagrosjogja.com/ckfinder/userfiles/files/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • https://milagrosjogja.com/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • https://milagrosjogja.com/ckfinder/userfiles/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://milagrosjogja.com/ckfinder/userfiles/files/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://milagrosjogja.com/ckfinder/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://milagrosjogja.com/ckfinder/userfiles/files/free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://milagrosjogja.com/ckfinder/userfiles/files/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • https://milagrosjogja.com/ckfinder/userfiles/files/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • https://milagrosjogja.com/ckfinder/userfiles/files/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://milagrosjogja.com/ckfinder/userfiles/files/minecraft-free-download_GM479516143.pdfIn PDF document text
    • https://milagrosjogja.com/ckfinder/userfiles/files/how-to-get-free-skin-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://milagrosjogja.com/ckfinder/userfiles/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://milagrosjogja.com/ckfinder/userfiles/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://milagrosjogja.com/ckfinder/userfiles/files/hack-coin-master-apk-358_GM406889139.pdfIn PDF document text
    • https://milagrosjogja.com/ckfinder/userfiles/files/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://milagrosjogja.com/ckfinder/userfiles/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://milagrosjogja.com/ckfinder/userfiles/files/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • https://milagrosjogja.com/ckfinder/userfiles/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://milagrosjogja.com/ckfinder/userfiles/files/roblox-free-akatsuki-shirt_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FAD 24072 bytes
SHA-256: de81798510eb3a51b20d9c556ecbf8a26e99192fab3223af7442f0201bba59e4
font_01_sfnt_off00008640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8640 18468 bytes
SHA-256: 91a02aab63c8ebc905d85044b2323a773c3218729de5110c35effcd6d7560349

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